[patch] drm/nouveau/disp: add a comment on confusing loop

[Dan Carpenter]

The "ret = -EIO" is deliberate.  It's a very uncommon thing to do and it
upsets static checkers because they normally would expect "ret == -EIO".

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
index 1bd4c63..2bc45ae 100644
--- a/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
+++ b/drivers/gpu/drm/nouveau/core/engine/disp/dport.c
@@ -322,6 +322,7 @@ nouveau_dp_train(struct nouveau_disp *disp, const struct nouveau_dp_func *func,
 	while (*link_bw > (dp->dpcd[1] * 27000))
 		link_bw++;
 
+	/* set ret to -EIO on the last loop iteration */
 	while ((ret = -EIO) && link_bw[0]) {
 		/* find minimum required lane count at this link rate */
 		dp->link_nr = dp->dpcd[2] & DPCD_RC02_MAX_LANE_COUNT;